WO2007113924A1 - Method and device for manufacturing spiral spacer - Google Patents

Abstract

[PROBLEMS] To increase productivity. [MEANS FOR SOLVING PROBLEMS] This device for manufacturing a spiral spacer comprises a tension member wire disposed at its center and a spacer body part covered on the outer periphery of the tension member wire and having a plurality of spiral grooves formed in the outer periphery thereof. A twisting device (10) holding the tension member wire (A) and imparting twist thereto is installed immediately before a non-rotating die (12) for extruding a molten resin for molding for the spacer body part to the outer periphery of the tension member wire (A). The twisting device (10) comprises holding mechanism parts (100) for the tension member wire (A) and a twisting mechanism part (101) for the holding mechanism parts (100). The holding mechanism parts (100) are disposed oppositely to each other on both sides of the tension member wire (A), and comprise a plurality of rollers (100b) formed in pairs and supporting the tension member wire (A). The multiple sets of rollers (100b) are disposed along the extension direction of the tension member wire (A). High friction members (100j) are installed on the outer peripheral surfaces of the rollers (100b).

Description

 Specification

 Method and apparatus for manufacturing spiral spacer

 Technical field

 TECHNICAL FIELD [0001] The present invention relates to a method and apparatus for manufacturing a spiral spacer, and particularly to a method and apparatus for manufacturing a spacer having an SZ spiral groove.

 Background art

 [0002] In an optical fiber spacer manufacturing apparatus having an SZ groove, when a rotating die that reciprocates is used, a resin flow path that forms a spiral groove, or a resin flow path for a groove identification tracer If the rotation mechanism is provided in consideration of the above, the manufacturing apparatus becomes complicated and large, and a large-capacity drive motor is required to rotationally drive the rotary die having such a structure.

 [0003] By the way, in the manufacturing apparatus having such a configuration, in order to improve productivity, high-speed rotation of the drive motor is an essential condition. However, as the motor capacity increases, the internal resistance of the motor increases. Therefore, there has been a limit in increasing the production rate substantially.

 [0004] On the other hand, by twisting the tensile strength member upstream of the rotating die and the downstream product in the direction opposite to the rotating direction of the rotating die, the twist angle of the rotating die is suppressed, Patent Documents 1 and 2 propose manufacturing a spacer at a higher speed by reducing the load.

 [0005] However, all of these proposals improve secondary problems that occur when rotating dies are used, and the use of rotating dies themselves has not changed. Improvement was difficult.

[0006] Patent Document 3 discloses a spacer that forms a spiral groove (SZ groove) in which a spiral groove without using a rotating die is alternately reversed by rotating (reversing) a tensile strength wire in front of the die. A manufacturing method has been proposed.

[0007] According to the manufacturing method proposed in Patent Document 3, since a rotating die is not used, a significant improvement in production speed can be expected, but there are technical problems described below. Patent Document 1: JP-A-1-303408

 Patent Document 2: JP-A-11-95077

 Patent Document 3: Japanese Patent Laid-Open No. 61-167522

 Patent Document 4: JP-A 55-597

 Disclosure of the invention

 Problems to be solved by the invention

 That is, in the manufacturing method proposed in Patent Document 3, a tensile strength line is gripped between a pair of belts, and the tensile strength line is twisted together with the belt to form an SZ-shaped spiral groove. Even if a material with a sufficiently large coefficient of friction, such as resin rubber, is used for the belt that grips the tensile strength line, it is difficult to sufficiently improve its gripping force and frictional force, and high-speed production is executed as it is. Is difficult.

 [0009] In addition, in order to strengthen the adhesive strength with the spiral coating portion, the tensile strength wire may be pre-coated with a synthetic resin before the spiral coating portion is formed. When using a tensile force line, the above-described gripping mechanism using the belt cannot provide a sufficient twist angle at which the gripping portion easily slips, and a desired high-speed production cannot be expected.

 [0010] Note that Patent Document 4 also proposes an example in which the product is twisted downstream of the rotary die, but in this method, the melt-extruded product needs to be completely solidified. For this reason, the cooling section becomes longer in proportion to the manufacturing speed, the positions where twisting is possible are separated, the twisting effect is diluted, and high-speed manufacturing becomes difficult.

 The present invention has been made in view of such conventional problems, and its object is to provide a method and apparatus for manufacturing a spiral spacer that enables desired high-speed production. Is to provide a place.

 Means for solving the problem

[0012] In order to achieve the above object, the present invention provides a spacer main body having a tensile wire disposed at the center and a coating formed on the outer periphery of the tensile wire, and a plurality of spiral grooves formed on the outer periphery. When the spiral spacer having a portion is manufactured, the tensile strength wire is gripped immediately before the non-rotating die for extruding the molten resin for forming the spacer main body to the outer periphery of the tensile strength wire. In the method of manufacturing a spiral spacer that imparts twisting to it, the tensile strength wire is a steel wire, G A resin coating layer is provided on the outer periphery of a tensile body such as FRP or KFRP, and the gripping of the tensile line is arranged so as to be opposed to each other with the tensile line in the center. The pair of rollers sandwiching the wire is used as a pair, and the roller is subjected to a high friction treatment or a high friction member is provided at least in a portion in contact with the tensile strength line.

 [0013] According to the method for manufacturing a spiral spacer configured as described above, the gripping of the tensile strength line is arranged so as to be opposed to each other with the tensile strength line as a center, and a pair of gripping the tensile strength line. When a roller coating layer is provided on the mine tension line, the roller is subjected to a high-rubbing treatment at least in a portion that contacts the tensile strength line or a high friction member is provided. However, it can be firmly held without slipping, a sufficient twist angle can be obtained, and the desired high-speed production can be achieved.

 [0014] The high-friction soldering treatment or the high-friction member can have heat resistance that can withstand the temperature conditions when it is cooled after pre-heating the tensile strength wire.

 [0015] Further, the present invention provides a spiral spacer comprising a tensile strength line disposed at the center and a spacer main body portion that is coated on the outer periphery of the tensile strength line and has a plurality of spiral grooves formed on the outer periphery. When manufacturing the spacer, the tensile strength wire is gripped and twisted just before the non-rotating die for extruding the molten resin for forming the spacer main body to the outer periphery of the tensile strength wire. In a spiral spacer manufacturing apparatus in which a twisting device is installed, the twisting device includes a gripping mechanism portion of the tensile strength line and a twisting mechanism portion of the gripping mechanism portion, and the gripping mechanism portion includes: It is arranged so as to be opposed to each other with the tensile strength line as the center, and has a plurality of rollers that form a pair to sandwich the tensile strength line, and the roller has high friction at the part that contacts the tensile strength line. Treatment was performed or a high friction member was provided.

[0016] According to the helical spacer manufacturing apparatus configured as described above, as in the above manufacturing method, the tension line can be firmly held without slipping, and a sufficient twist angle can be obtained. In addition, the twisting device installed on the upstream side of the non-rotating die can add the necessary twisting angle to the tensile strength line, so the die force that does not require the introduction of a twisting mechanism downstream of the die can also be achieved. The extruded spiral spacer can be easily slowly cooled by cooling means such as air cooling, hot water cooling, and water cooling, and this reduces the effect of shrinkage due to the cooling of the coating resin. Thus, a spiral spacer having a stable shape can be obtained.

 [0017] The high friction member can be configured to have a member force having a dynamic friction coefficient of 0.3 or more.

[0018] The high friction treatment is performed by sandblasting the surface of a steel roller, or

It can be selected from either a rubber coating process in which silica is embedded in the surface of a steel roller.

 The invention's effect

 [0019] According to the method and apparatus for manufacturing a spiral spacer having the above-described configuration, a well tension line can be firmly held without slipping, a sufficient twist angle can be obtained, and desired high-speed production can be achieved. Is achieved.

 BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, embodiments of a method and apparatus for manufacturing a spiral spacer according to the present invention will be described in detail with reference to examples and specific examples. 2 to 10 show an embodiment of a method and apparatus for manufacturing a spiral spacer according to the present invention.

In the embodiment shown in these drawings, the spiral spacer S shown in FIG. 1 is manufactured, and the spiral spacer S includes a tensile line A and a tensile line arranged at the center. And a spacer main body D that is formed on the outer periphery of A and has a plurality of spiral grooves C formed on the outer periphery.

[0022] For the tensile strength wire A, for example, an adhesive layer A2 is provided on the outer periphery of a tensile strength body A1 having a single steel wire force having an outer diameter of 3. Omm or less, and a core coating layer A3 is provided on the outer periphery of the adhesive layer A2. Yes. The adhesive layer A2 is formed to have a predetermined thickness so as to cover the outer peripheral surface of the tensile body A1 without a gap, and improves and reinforces the adhesive structure between the tensile body A1 and the core coating layer A3.

 [0023] The spiral groove C provided on the outer periphery of the spacer main body D accommodates an optical tape core wire or the like. In the example shown in FIG. Although five are provided at equal angular intervals, the shape and number of grooves can be arbitrarily set, not limited to the illustrated state.

[0024] The spiral groove C is formed in a so-called SZ spiral that repeatedly inverts along the longitudinal direction of the spacer S at predetermined inversion angles. In this case, the inversion angle can be arbitrarily set according to the number of spiral grooves C and the like. The spacer body D is formed by extruding a synthetic resin, and at this time, a tracer T is provided on a part of the outer periphery. The tracer portion T is for identifying the spiral groove D, and for example, a colored resin different from the spacer main body portion D is used. The spiral spacer to be manufactured by the present invention is not limited to the cross-sectional structure shown in FIG. 1.For example, GFRP or KFRP is used as the tensile body A1, and the core coating layer A3 is directly provided on the outer periphery thereof. It may be of a different structure.

 FIG. 2 is an overall layout diagram of a manufacturing apparatus used in the manufacturing method of the present invention. The manufacturing apparatus includes a twisting device 10, a non-rotating die 12, and two first to second extruders 14. , 16, bobbin 18 wound with tensile body A1, degreasing tank 20, preheating tank 22 for tensile body A1, cooling device 24 for adhesive layer A2 and core coating layer A3, first take-up machine 26, A preheating tank 28 for the tensile strength line A, a cooling tank 30 for the spiral spacer S, and a second take-up machine 32 are provided.

 The twisting device 10 is installed on the upstream side immediately before the non-rotating die 12 and is installed and supported on the support base 34. Details of the twisting device 10 are shown in FIGS. The twisting device 10 shown in these drawings includes a gripping mechanism portion 100 of the tensile strength line A and a twisting mechanism portion 101 of the gripping mechanism portion 100.

 [0028] As shown in FIG. 5, the gripping mechanism unit 100 is rotatably supported via a bearing 38 provided on a pair of support columns 36 erected on a support base 34. This is shown in Figs. 6 and 7. The gripping mechanism portion 100 shown in these drawings includes a substantially concave frame body 100a having one end opened, a plurality of rollers 100b that form a pair, and a pair of hollow shaft portions 100c.

 [0029] The frame body 100a is formed in a substantially rectangular planar shape, and a pair of hollow shaft portions 100c are coaxially fixed at both ends in the longitudinal direction. One of the pair of hollow shaft portions 100c is slightly longer than the other side, but the other is substantially the same configuration, and the central axis in the longitudinal direction is coaxial. It is fixed to the frame 100a.

 [0030] In this hollow shaft portion 100c, a tensile strength line A is inserted on the central axis, and a bearing 36 attached to a support column 34 is fitted on the outer periphery of the intermediate position of each hollow shaft portion 100c. Thus, the frame body 100c is rotatably supported on the center axis of the hollow shaft portion 100c.

[0031] The roller 100b is sandwiched from both sides around the tensile strength line A in a pair. A plurality of sets (three sets in this embodiment) are arranged in a row at a predetermined interval along the longitudinal direction of the tensile strength line A. In the example shown in Figs. 6 and 7, the force with which three sets of rollers 100b are arranged in a row. The number of rows depends on the thickness of the tensile strength line A and the properties, etc. It selects suitably so far.

[0032] In FIG. 6, three rollers 100b arranged in three rows are rotatably supported by the fixed plate lOOd, and the three lower rollers 100b are rotatably supported by the movable plate 100e. Has been.

 [0033] The fixed plate lOOd and the movable plate 100e are flat plates having the same length, and extend in the longitudinal direction of the frame 100a. These plates lOOd, 100e are supported by a pair of guide rods 100f extending in the short direction of the frame 100a.

 [0034] In this case, the fixed plate lOOd is fixed to the guide rod 100f, and the movable plate 100e is attached to the guide rod 100f so as to be close to and away from the fixed plate lOOd.

[0035] Three compression coil panels lOOg abut on the side surface of the movable plate 100e, and each compression coil spring lOOg is attached with an adjustment screw lOOh for adjusting the amount of compression. The adjusting screw 10 Oh is screwed into a screw hole formed through the frame body 100a. With this configuration, when the screwing amount of the adjusting screw lOOh is changed, the distance between the movable plate 100e and the fixed plate lOOd changes, and as a result, the distance between the pair of rollers 100b can be adjusted.

 As shown in FIG. 8, each roller 100b has a V-shaped groove 100i formed around the outer peripheral surface. A tensile strength line A is inserted into the V-shaped groove 100i. In this embodiment, the opening angle is set to 90 °.

 [0037] The depth of the V-shaped groove 100i is equal to the radius of the tensile strength line A. Using the V-shaped groove 100i configured in this way, when the tensile strength line A is sandwiched between a pair of rollers 100b, the contact points between the tensile strength line A and the V-shaped groove 100i become symmetrical at four locations, and the stress is evenly distributed. After being dispersed, it becomes even more slippery. The opening angle of the V-shaped groove 100i need not be limited to 90 °, and can be arbitrarily set within a range of 90 ° to 120 °, for example.

[0038] Further, each roller 100b is provided with a high friction member 100J on the outer peripheral surface with which the tensile strength line A contacts. This high friction member 100j is, for example, silicone rubber (dynamic friction coefficient 0. 54) Forces such as silicon embedded rubber urethane (dynamic friction coefficient 0.72) are also constructed, and such members are embedded in the outer peripheral surface of the steel roller 100b.

 [0039] In the high friction member lOOj, the surface temperature of the core coating layer A3 heated by the preheating tank 28 is about 80 ° C, and such temperature is continuously stored. Therefore, it is desirable to have heat resistance that can withstand this temperature.

 [0040] Further, in particular, in the case of the present embodiment, the tensile strength wire A is provided with the core coating layer A3, and the gripping force higher than the crushing strength cannot be held by the roller 100b. In this case, the high friction member lOOj has a dynamic friction coefficient force of 0.3 or more with the core coating layer A3. Preferably, those of 0.5 or more are suitable. Such a friction coefficient can be obtained by using a steel roller or a steel roller that is sandblasted at the contact portion with the tensile strength line A, which is formed only by the high friction member 100j, as a base material, and silica on the surface. Apply high-friction treatment, such as those with a rubber coat embedded in.

 [0041] Further, the high friction member lOOj and the high friction treatment need not be provided in the entire outer peripheral surface of the roller 100b. For example, the high friction member lOOj may be provided only in the portion of the V-shaped groove 100i where the tensile strength line A contacts. .

 On the other hand, as shown in FIGS. 4 and 5, the twisting mechanism 101 includes a drive motor 101a, driving and driven pulleys 101b and 101c, and a timing belt 101d. The drive motor 101a is fixedly installed on the support base 34.

 [0043] A driving pulley 101b is fixed to the rotating shaft of the drive motor 101a, and a driven pulley 101c is fixed to the end of one hollow shaft portion 100c of the gripping device 100, and between the driving pulley 101b and the driven pulley 101c. The timing belt 101d is wound around.

 [0044] The drive motor 101a is driven so that the rotation direction is reversed at every predetermined rotation, and thereby, the hollow shaft portion 100c connected through the timing belt 101d is swung and rotated. As a result, the frame body 100a of the gripping mechanism section 100 holding the tensile strength line A between the rollers 100b is swung and rotated at a predetermined cycle, whereby a predetermined twist is applied to the tensile strength line A.

[0045] In this case, the twisting torque applied to the tensile strength line A should be 90 ° ZlOm or less. If the desired twisting torque is set, it is confirmed that the twisting torque inherent in the tensile strength line A does not affect the reversal pitch and reversal angle of the spiral spacer S.

[0046] A non-rotating die 12 is disposed downstream of the twisting device 10. In this case, the installation interval between the gripping position of the tensile strength line A of the twisting device 10 and the non-rotating die 12 is too large. Untwisting, etc., and the main body resin is less likely to follow the twist imparted by the twisting device 10, so it is desirable to set it to 100 Omm or less, more preferably 500 mm or less. The twist angle applied to line A is uniformly reflected in the groove trajectory. In addition, it is desirable that the distance from the gripping position of the tensile strength line A to the take-up machine 32 is 3000 mm or more, and more preferably 10,000 mm or more, so that the twist angle is uniform with the die 12 that provides the SZ groove. It is reflected in the groove trajectory.

 [0047] The spacer S is manufactured as follows. The bobbin 18 is provided with a tensile body A1, which is fed out sequentially. Then, after degreasing treatment in the degreasing tank 20, it is preheated in the heating tank 22, and thereafter, the first extruder 14 is used to form the adhesive layer A2 and the core coating layer A3 on the outer periphery of the tensile body A1. The forming resin is extruded by two-layer coextrusion, and then cooled in the cooling tank 24 to obtain a tensile strength line A.

 Next, from the second extruder 16, the forming resin of the spacer main body D and the tracer T is coated on the outer periphery of the tensile strength line A inserted through the non-rotating die 12. Prior to coating the spacer main body D, the core coating layer A3 is preheated by the preheating tank 28, and then the second extruder 16 is used to connect the main body D and the tracer T. Two layers of extrusion resin are extruded in the molten state.

 [0049] In this case, immediately before the non-rotating die 12 for extruding the molten resin for forming the spacer body D to the outer periphery of the tensile strength line A, the tensile strength line A is gripped and twisted. A twisting device 10 is installed.

[0050] In the case of the present embodiment, the twisting device 10 includes the gripping mechanism portion 100 of the tensile strength line A and the twisting mechanism portion 101 of the gripping mechanism portion 100, and the gripping mechanism portion 100 transmits the tensile strength line A. A plurality of rollers 100b are arranged in a center so as to face each other and sandwich the tensile line A, and a plurality of rollers 100b are arranged along the extending direction of the tensile line A. Arranged. [0051] In particular, since the roller 100b of the gripping mechanism unit 100 is provided with the high friction member 100j on the outer peripheral surface thereof, the tensile strength line A provided with the core coating layer A3 may slip. It can be gripped firmly and a sufficient twisting angle can be obtained, and the twisting device 10 installed on the upstream side of the non-rotating die 12 can add the necessary twisting angle to the tensile strength line A. Therefore, it is easy to gradually cool the spiral spacer extruded from the die 12 that does not require the introduction of a twisting mechanism downstream of the die 12 by cooling means such as air cooling, hot water cooling, and water cooling. In this way, it is possible to reduce the influence of shrinkage accompanying cooling of the coating resin, and to obtain a spiral spacer S having a stable shape.

 Note that the cooling device 30 shown in FIG. 2 solidifies the molten resin extruded from the non-rotating die 12, and may employ slow cooling such as air cooling, hot water cooling, and water cooling. it can. The spiral spacer S manufactured at a predetermined speed is wound up by a non-illustrated winder.

 [0053] The production method of the present invention will be described below with reference to comparative examples of more specific production examples.

 [0054] Manufacturing method ¾ Example ί

 A spiral spacer S having the shape shown in FIG. 1 was manufactured by the following method. In this embodiment, the number of spiral grooves C was five. A single steel wire with an outer diameter of 1.6 mm is used as the tensile strength A1, maleic anhydride-modified polyethylene (Nippon Yuker: GA006) is used as the resin for forming the adhesive layer A2, and the core coating layer A3 is formed. A linear low-density polyethylene blend product (both made by Nippon Car Co., Ltd .: NUCG7641: NUCG5652 = 3: 2) is coextruded with the first extruder 14 and then subjected to a cooling process. Obtain 8mm tensile strength line A.

 [0055] Next, the tensile strength wire A is preheated in a heating bath 28 until the surface temperature reaches 60 ° C, and then the tensile strength wire A is drawn into a spiral-coated die (a non-rotating die 12) having a spacer-shaped die. Introduced at a speed of 15 mZmin, high density polyethylene (Prime Polymer Co., Ltd .: HI—ZEX6600MA) is used as the resin for forming the spacer body D, and colored high density polyethylene (Sumika) is used as the resin for forming the tracer part T. A spiral spacer S is constructed by co-extrusion of PE-8Y1760 (Color Co., Ltd.) with a spiral coated die.

[0056] The tensile strength line A is gripped by a pair of gripping rollers 100b made of silicone rubber (dynamic friction coefficient 0.58) at a position 550mm upstream of the spiral coated die (non-rotating die 12). It is gripped with a holding stress of 20kgf, and is rotated and reciprocated 360 ° at a speed of 50 cycles Zmin by the twisting device 10 to give a helical coating with a virtual outer diameter of 6.5 mm.

 [0057] The helically coated molded article is provided with a conduit having an inner diameter of 10 mm at the inlet, and is introduced into the reduced pressure circulating hot water cooling water tank 30 adjusted to 60 ° C to cool evenly to the inside of the rib cross section. . The shape of the resulting spiral spacer S is 5 mm U-shaped with rib outer diameter 6.5mm, groove outer width 1.6mm, groove inner width 1.5mm, groove depth 1.6mm. The cross-section had a stable SZ groove locus with a pitch of 150 mm and an inversion angle of 290 °. The rib inclination angle of the spiral spacer S was 5.5 °.

 [0058] Manufacturing method example 2

 As a gripping roller 100b for tensile strength line A, a roller with SKD51 (high speed tool steel) as a base material and a binder coat containing silica particles on the surface (dynamic friction coefficient 0.80, particle size of about 60 μm, The paint mixed with silica particles and ceramic particles was directly coated on the gripping roller with one steel roller as the base material to form a film with a thickness of about 25 to 45 m. Since the surface of the coated core is hardened by the particles and ceramic particles and the coefficient of dynamic friction is improved, the gripping stability is improved when the steel wire twisting device is operated at high speed, and the coated core is in direct contact with the binder part. Because the steel material is used for the base material, it is excellent in durability and wear resistance.The dynamic friction coefficient can be adjusted by changing the particle size of silica particles and ceramic particles. A spiral spacer S having an SZ groove locus was obtained under the same conditions as in Example 1 except that one pair of) was used. The fine silica particles arranged on the surface of the gripping roller 100b bite into the surface of the core coating layer A3, thereby suppressing the slip of the core coating layer A3 in the gripping part 100 and improving the wear resistance.

 [0059] The shape and dimensions of the obtained spiral spacer S are 5 ribs with an outer diameter of the rib portion of 6.5 mm, an outer groove width of 1.6 mm, an inner groove width of 1.5 mm, and a groove depth of 1.6 mm. It had a U-shaped cross section and had a stable SZ groove locus with a pitch of 150 mm and an inversion angle of 290 °. The rib inclination angle of the spiral spacer S was 5.5 °.

 [0060] Comparative Example 1

About the manufacturing method of the license spacer configured in the same manner as in Example 1, the core coating layer A3 As a method of gripping the tensile strength line A provided with a reciprocating reversal, a pair of steel rollers (dynamic friction coefficient 0.12) was used and production was attempted under the following conditions.

 The core coating layer A3 with an outer diameter of 2.8 mm obtained in the pre-coating process was reciprocally reversed by a gripping roller (high speed tool steel: SKH51) installed 550 mm upstream of the spiral coating die. A spiral spacer with SZ groove trajectory was obtained. Here, in order to give an SZ groove trajectory with a pitch of 150 mm and a reversal angle of 290 °, a rotation angle of 480 °, a gripping stress of lOOkgf and a steel wire twisting device were set at a speed of 50 cycles Zmin. The spacer had a SZ groove trajectory with a pitch of 150 mm and a reversal angle of 260 to 290 ° .The inner core coating layer A3 was deformed by one of the gripping rollers. It has been. The rib inclination angle was 14.5 °.

[0061] Comparative Example 2

 Regarding the method of manufacturing the spiral spacer configured in the same manner as in Example 1, as a method of gripping the tensile strength line A provided with the core coating layer A3 and reciprocally reversing it, a roller made of urethane rubber (dynamic friction coefficient 0. Using a pair of 72), production was attempted under the following conditions.

[0062] Spiral space is obtained by reciprocating the core coating layer A3 with an outer diameter of 2.8 mm obtained in the preliminary coating process with a gripping roller (made of urethane rubber) installed at a position of 550 mm upstream of the spiral coating die. When we tried to give the SZ groove locus to the die, scraping of the urethane roller occurred from the contact part of the core coating layer A3 and it was mixed in the spiral coated die, and production was stopped.

[0063] Comparative Example 3

 As a method of manufacturing a spiral spacer configured in the same manner as in Example 1, a nylon roller (dynamic friction coefficient 0.20) is used as a method of holding and reversing the tensile strength line A provided with the core coating layer A3. Using three pairs, production was attempted under the following conditions.

[0064] The core coating layer A3 with an outer diameter of 2.8 mm obtained in the pre-coating process was gripped at a gripping roller (made of nylon roller) at a position of 550 mm upstream of the spiral coating die with a gripping stress of 60 kgf. The wire twisting device is operated to reciprocate at 720 ° at a speed of 50 cycles Zmin with a wire twisting device, and the helical coating is applied to the tensile strength body with an SZ groove locus on the tensile coating by applying a grease coating with a virtual outer diameter of 6.5 mm. obtain. SZ groove locus of the obtained spiral spacer is pitch 1 50 mm, reversal angle was 230 to 290 °, and slip occurred at the gripping part of the core coating layer A3. Therefore, the force and the predetermined reversal angle could not be obtained, and the value was also unstable. The rib inclination angle of the obtained spiral spacer was 6.0 °.

 Industrial applicability

[0065] According to the manufacturing method and manufacturing apparatus of the spiral spacer according to the present invention, the SZ spiral spacer can be produced at high speed, so that it can be effectively used in this kind of field. Can do.

 Brief Description of Drawings

 [0066] FIG. 1 is a perspective view and a longitudinal sectional view of an essential part showing an example of a spiral spacer obtained by the manufacturing method according to the present invention.

 FIG. 2 is a side view showing the overall arrangement of a manufacturing apparatus used in the method for manufacturing a spiral spacer according to the present invention.

 FIG. 3 is an enlarged side view of the twisting device of FIG.

 FIG. 4 is a front view of FIG.

 FIG. 5 is an enlarged view of the main part of FIG.

 FIG. 6 is an enlarged top view of the gripping mechanism shown in FIG.

 FIG. 7 is an enlarged side view of the gripping mechanism shown in FIG.

 FIG. 8 is an enlarged view of a roller of the gripping mechanism section shown in FIG.

 Explanation of symbols

 [0067] S spiral spacer

 A Tensile wire

 B Adhesive resin layer

 C spiral groove

 D Spacer body

 T Tracer section

 10 Twisting device

 100 Grip mechanism

100b roller lOOj High friction member 101 Twist mechanism 12 Non-rotating die

Claims

The scope of the claims  [1] When manufacturing a spiral spacer including a tensile wire disposed in the center and a spacer main body formed with a coating on the outer periphery of the tensile wire and formed with a plurality of spiral grooves on the outer periphery. Manufacturing of a spiral spacer that grips the tensile strength wire and imparts twist to the non-rotating die that extrudes the molten resin for forming the spacer main body to the outer periphery of the tensile strength wire. In the method  The tensile strength wire is a steel wire, GFRP, KFRP, etc. with a resin coating layer provided on the outer periphery of the strength material.  The tensile wire is gripped by a plurality of rollers that are arranged in a pair so as to face each other with the tensile wire in the center and sandwich the tensile wire.  The method of manufacturing a spiral spacer, wherein the roller is provided with a high-friction member or a high-friction member that performs at least a portion in contact with the tensile strength line.  [2] The spiral screw according to claim 1, wherein the high friction wrinkle treatment or the high friction member has heat resistance capable of withstanding a temperature condition when the tensile strength wire is preheated and then cooled. A manufacturing method for pacers. [3] When manufacturing a spiral spacer including a tensile wire disposed in the center and a spacer main body formed with a coating on the outer periphery of the tensile wire and having a plurality of spiral grooves formed on the outer periphery. A twisting device for gripping the tensile strength wire and imparting a twist to the non-rotating die for extruding the molten resin for forming the spacer main body to the outer periphery of the tensile strength wire. In the installation equipment of the spiral spacer to be installed,  The twisting device includes a gripping mechanism portion of the tensile strength line, and a twisting mechanism portion of the gripping mechanism portion,  The gripping mechanism portion has a plurality of rollers that are arranged so as to be opposed to each other with the tensile strength line as a center, and are paired to sandwich the tensile strength line.  The apparatus for manufacturing a spiral spacer, wherein the roller is subjected to a high-friction process on a portion in contact with the tensile strength line or a high-friction member is provided. 4. The apparatus for manufacturing a spiral spacer according to claim 3, wherein the high friction member has a member force having a dynamic friction coefficient of 0.3 or more. The high friction treatment is selected from either performing sandblasting on the surface of a steel roller or applying rubber coating with silica embedded in the surface of a steel roller. The helical spacer manufacturing apparatus according to 3.